Bitcoin designed a "Peer-to-Peer Electronic Cash System", but peoples using it to scam others. Is that fault goes to the Bitcoin or Bitcoin creator? The mixer has designed to cut the links and receive clean coins, it's mostly using by those who care about privacy. If scammers or hackers using it then really can we blame the mixers? I don't think so. Also, fiat money using for fraud attempts, but we can't blame fiat. Mixers just break the links between transactions. It would be used by criminals or by legit Bitcoin users.

The forum doesn't moderate scams, if scammers using bitcoin to scam people then should the forum stop spread the words about Bitcoin. Same about mixers, if it's using by criminals, doesn't necessary to stop advertising here.